Some people love them, some don't. I guess you won't know which you are unless you give it a try. I think a good idea would be to get an inexpensive one (Goodwill) and see if you use it and like it. Then you could upgrade if you found it indispensable, but wouldn't have a huge investment in it if you found you didn't use it.
I've tried them and they seem like too much work to get them out and put them away and take too much room on my countertop for the few times I'd use it. I use a hand chopper or knife and cutting board for chopping and my blender for puree; either hand-grate or buy pre-grated cheese.